Ist and 2nd electron affinity of oxygen atom

1st electron affinity is usually exothermic as the energy released when the nucleus attracts additional electron is larger than the energy absorbed to overcome inter-electronic repulsion.

2nd electron affinity is always endothermic since an additional electron is added to a negative ion . Energy is absorbed to overcome inter-electronic repulsion between two negatively charged species .

• Assumptions of the kinetic molecular theory of ideal gas .
  Gases are made up of independent particles (atoms or molecules) moving in rapid motionContinue reading “Assumptions of the kinetic molecular theory of ideal gas .”